Add some more basic tests 🤷‍♂️

src/model/unity.test.js

@@ -0,0 +1,13 @@
+import Unity from './unity';
+
+describe('Unity', () => {
+  describe('libraryFolder', () => {
+    it('does not throw', () => {
+      expect(() => Unity.libraryFolder).not.toThrow();
+    });
+
+    it('returns a string', () => {
+      expect(typeof Unity.libraryFolder).toStrictEqual('string');
+    });
+  });
+});